This is a new car Bluetooth hands-free 3.5mm AUX stereo audio receiver， which has many functions such as， hands-free， can work as charger and receives audio signal by Bluetooth. And， it can easily and simply to upgrade your car stereo audio and receive the audio signal of your Smartphone， iPad， iPod and other Bluetooth ¡§C enabled mobile devices. Moreover， this item is attached with a USB port which can charges mobile devices such as， cell phones， Tablet， MP3/4， etc and it also includes a 3.5mm audio cable which can transfer the audio signal from general devices (without Bluetooth function) to car stereo. With this product， your car stereo can wirelessly and synchronously play the music of Bluetooth- enabled mobile devices and you greatly enjoy wonderful music and hands-free calls. With compact portable design.Easily paired， no pairing code. Can easily and simply to upgrade the car stereo audio. Be attached with a standard USB charging port， receive audio signal by wireless Bluetooth or transfer the audio signal by the included 3.5mm audio cable. Support all car stereo with AUX IN. Support universal control function (such as play/pause， previous song， next song， etc). Charging function: standard USB port; Bluetooth Version: Bluetooth3.0; Compatibility: ALL Bluetooth versions; Applications: car stereo with AUX IN; Bluetooth hands-free function; Support A2DP， AVRCP; Output: 5V/2.1A; SNR :> 93dB; THD<0.05%; Frequency response: 20Hz-20KHz??0.3dB; Output level: 1Vrms Color: Black Size: 7.1 x 3.6 x 2.2cm Package weight: 1.7oz/48g The minimum length of the 3.5mm audio cable (flexible): 25cm Charging function: standard USB port Bluetooth Version: Bluetooth3.0 Compatibility: ALL Bluetooth versions Applications: car stereo with AUX IN Bluetooth hands-free function Support A2DP， AVRCP Output: 5V/2.1A SNR : > 93dB THD: <0.05% Frequency response: 20Hz-20KHz¡À0.3dB Output level: 1Vrms